WiFi Streaming Versus An Ethernet Cable Connection

And I have never heard a difference between ethernet and wifi...just me.

Wi-fi streaming works great. No complaints here.

I use Aurrender streamers now. I find streaming from Qobuz and from internal files exactly the same sound quality. I run both of my streamers from wall wart wifi extenders with a short Ethernet cable to the extender. 

My preference is to keep wireless emission to an absolute minimum in my listening space. Zero BT, WiFi even cellular while listening.  

I use wireless streaming and find the closer you are to the router, the better.

Agreed. Wi-Fi is to erratic. 

I am 98% fiber for our entire home. 

When you finally give up on wifi and hook up a wired connection you'll be happy.

Many routers are cheaply built and possibly a source of noise.  Wi-fi might help.  Search this forum for fiber media converters, and you will find several threads on inserting a fiber optic cable between your router and streamer (cost is < $100).  I did this on both of my systems.  It made a significant improvement on my smaller system which had been directly wired to the modem/router.  It made no noticeable difference in my main system, which was much further away and had several switches between the router and the streamer.  

I don’t think Wi-Fi dongle is the answer. Before you change anything else, try a Ethernet passive filter like ENO. It comes with 30 days money back guarantee. 
https://www.networkacoustics.com/shop/eno-ethernet-filter/

I used to own the BDP3.  I gave up on it due to the software management issues, but it sounded excellent, and I thought Qobuz was really good on it .  I used the WiFi dongle and preferred wired